Furnace.



PA-TENTED FEB. e, 1906. s. P. GREY.. FURNAOE.

1 APPLICATION FILED 001.. 3,1904 V 2 SHEETS-SHEET 1 Sylvester Grey 'lfrt'illliih l i tl'lflili iflil lili ll lhfljfll.

SYLVESTER P. GREY, OF lNUl/ihlrklULitrl, 1N UiANr-i, rtldhlliih illt TU MACHINERY EXCHANGE. OF .I'NUlAhlril tllilhi, lhlllfrthlrr, A. titl PARTNERSHIP.

FUHNIMJE.

Patented Feb. 6, recs.

whitish filed October 3,1904. Serial No. 227,029.

To all whom it may concern.-

Be it known that I, SYLVESTER P. GREY, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

In the construction shown in my Patent No. 739,491, issued September 22, 1.903, the hollow grate'bars are separated by intermediate plates which communicate directly with the ash-pit, and difficulty has been experienc'ed in keeping the coals free on the grate and in getting rid of clinkers.

The object of my present invention is to provide means, first, for introducing the fuel to the tops of the hollow grate-bars; second, to provide an integral structure which shall con sist of fuel-introducing means flanked upon each side by a hollow grate-bar; third, to arrange between each pair of fuel-introducing -meansand the accompan ing hollow grate- 1 bars an oscillating or roc (mg grate-bar, by

means of which the grate-surface may be freed from clinkers, and, fourth, to provide such improvements in details of construction as shall be hereinafter pointed out.

The accompanying drawings illustrate my invention.

Figure 1 is a perspective view of a furnace constructed in accordance. with my invention, the fuel-initiating means being omitted and the face-plate being also omitted. Fig. 2 is a central vertical section through the fuel-introducing chamber of one of the castings, showing also the fuel-injecting means and the walls of the furnace. Fig. 3 is a plan of a air of fuel-introducing chambers, of four anking air-trunl s, and an intermediate rocking grate-bar; and Fig. 4, a sectional detail of the transverse air trunk or box and adjacent parts.

In the drawings, 10 10 indicate the side walls of the furnace. 11 indicates the bridge wall, and 12 the face-plate. The bridge-wall is provided at its forward side at a point below its top with a substantially horizontal step, upon which is arranged an air trunk or box 13, as in the patent referred to, said box being made of mating sections, as clearly shown in Fig. 3.

Appropriate sections of the air-box 13 are provided at the front with openings 14, the r purpose of which will be made to appear, and

which lies Withinthe air-trunk 125.

The rate structure is com weed of a series of castings 20, intermediate rocking grate bars 21, and somewhat similar rocking bars 22, which form. the two sides of the grate structure. The casting 20 is provided with a fuel-chute 23, which extends longitudinally through the middle of the casting, the bottom of said chute being inclined upwardly and rearwardly, so that the rice est end of the channel is at the front of tie furnace, while the shallow end extends to the airtrunlr 13. Flanking the fuel-chute upon each side is an air-chamber 2 1, the bottom of which inclines upwardly and forwardly from the air-trunk toward the front of the furnace, and each of said chambers communicates at its rear end with one of the openings 14:. Each of these chambers is capped by a plurality of perforated fuel-receiving plates 25, as in the patent already referred to. The casting 20 is provided at its rear end with vertical flanges 26, which are adapted to pass behind cars 27, carried by appropriate portions of the airtrunk 13. Flanking each of the air-chambers 2 1: is a series of teeth 28, which mesh. with similar teeth 21, formed on the rocking grate-bars 21 and 22.

Bolted to (or formed integral with, if de sired) the forward deeper end of each fuelchute 23 is a hopper structure 30, within which is mounted a plunger 31, said plunger being reciprocated by means of a crank 32, carried by a shaft 33, the arrai'lgement being such that by turning shaft fuel from the hopper 30 may be injected into the fuel-chute 23 and forced rearward and upward and caused to overflow the plates 25 and the ilanhing rocking grate-bars 21 22 in a manner well known in that form. of automatic stoker known in the market as the American.

In order to prevent the accidental displacement of the plates 25, they are provided with mating portions 25, (see Fig. 4,) and the rear plate 25 is provided. with a tongue 25", which passes beneath the top plate of the adjacent section of the air-chute ll. also find it advisable to provide the grate-bars 22 on their outer edges adjacent the walls 10 with. teeth 22, which are considerably finer than the teeth 21, so as to prevent anything but ashes from passing down into the ash-pit. The hollow grate-bars composed of the air-chamber 24 and the cap-plates 25 may be separated from the fuel-chute 23, if desired, and

then associated with the fuel-chute inthe manner illustrated; but I prefer to make them integral with the fuel-chute, because of the economy of construction and ease of assemblage;

The air-trunk will be connected to a suitable blast device, as shown in the patent already mentioned, and the steam-pipe 18 should be connected to a suitable steam-supply but it is deemed unnecessary to illustrate these features.

I claim as my invention' 1. In a furnace, the combination with an open-top fuel-chute, of a pair of air passages arranged one upon each side of said fuelchute and provided with perforated removable but normally stationary fuel-receiving caps, means for supplying a blast of air to said passages, and'a rocking grate-bar flanking each of said air passages.

2. In a furnace, the combination, with a transverse airtrunk, of longitudinal airtrunks extending forward therefrom and com municating therewith and-provided with perforated. normally stationary fuel-receiving tops, open-top fuel-chutes arranged between some of the pairs of said longitudinal airtrunks, and means for shoving fuel longitudinally into said chutes.

3, In a furnace, the combination, with a transverse air-trunk arranged across the furnace at the rear thereof, of longitudinal airtrunks extending forward therefrom and coming fuel ongitudinally into said chutes, and a steam-pipe runnin through said transverse air-trunk and disc thereof. V

4. In a furnace, the combination, with a transverse air-trunk, of longitudinal airtrunks leading therefrom and communicating therewith and provided with perforated fuel-receiving tops, longitudinal open-top fuel-chutes arranged between pairs of said longitudinal air-trunks, rocking grate-bars arrangedto flank each of said longitudinal air-trunks, and means for shoving'fuel longitudinally into said fuel-chutes.

5. In a furnace, the combination, with a transverse air-trunk arranged across the furnace at its rear, of longitudinal air-trunks leading therefrom and communicating therewith and provided with perforated fuel-receiving tops, longitudinal open-to fuelarging through the top chutes arranged between pairs of sai longi tudinal air-trunks, rocking grate-bars arranged to flank each of said longitudinal airtrunks, means for shoving fuel longitudinally into said fuel-chutes, and a steam-pipe arranged in the air-trunk and discharging through the top thereof.

In witness whereof I have hereunto set my hand and seal at Indianapolis, Indiana, this 29th day of September, A. D. 1904.

SYLVESTER P. GREY. 

